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[/] [openrisc/] [trunk/] [or1ksim/] [cpu/] [or32/] [execute.c] - Blame information for rev 671

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/* execute.c -- OR1K architecture dependent simulation
 
   Copyright (C) 1999 Damjan Lampret, lampret@opencores.org
   Copyright (C) 2005 Gy�rgy `nog' Jeney, nog@sdf.lonestar.org
   Copyright (C) 2008 Embecosm Limited
   Copyright (C) 2010 ORSoC AB
 
   Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>
   Contributor Julius Baxter <julius.baxter@orsoc.se>
 
   This file is part of OpenRISC 1000 Architectural Simulator.
 
   This program is free software; you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published by the Free
   Software Foundation; either version 3 of the License, or (at your option)
   any later version.
 
   This program is distributed in the hope that it will be useful, but WITHOUT
   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
   more details.
 
   You should have received a copy of the GNU General Public License along
   with this program.  If not, see <http://www.gnu.org/licenses/>. */
 
/* This program is commented throughout in a fashion suitable for processing
   with Doxygen. */
 
 
/* Most of the OR1K simulation is done in here.
 
   When SIMPLE_EXECUTION is defined below a file insnset.c is included!
*/
 
/* Autoconf and/or portability configuration */
#include "config.h"
#include "port.h"
 
/* System includes */
#include <stdlib.h>
 
/* Package includes */
#include "execute.h"
#include "toplevel-support.h"
#include "except.h"
#include "labels.h"
#include "sched.h"
#include "stats.h"
#include "opcode/or32.h"
#include "dmmu.h"
#include "immu.h"
#include "sim-cmd.h"
#include "vapi.h"
#include "debug-unit.h"
#include "branch-predict.h"
#include "sprs.h"
#include "rsp-server.h"
#include "softfloat.h"
 
/* Includes and macros for simple execution */
#if SIMPLE_EXECUTION
 
#define SET_PARAM0(val) set_operand(0, val, current->insn_index, current->insn)
 
#define PARAM0 eval_operand(0, current->insn_index, current->insn)
#define PARAM1 eval_operand(1, current->insn_index, current->insn)
#define PARAM2 eval_operand(2, current->insn_index, current->insn)
 
#define INSTRUCTION(name) void name (struct iqueue_entry *current)
 
#endif  /* SIMPLE_EXECUTION */
 
 
/*! Current cpu state. Globally available. */
struct cpu_state  cpu_state;
 
/*! Temporary program counter. Globally available */
oraddr_t  pcnext;
 
/*! Num cycles waiting for stores to complete. Globally available */
int  sbuf_wait_cyc = 0;
 
/*! Number of total store cycles. Globally available */
int  sbuf_total_cyc = 0;
 
/*! Whether we are doing statistical analysis. Globally available */
int  do_stats = 0;
 
/*! History of execution. Globally available */
struct hist_exec *hist_exec_tail = NULL;
 
/* Benchmark multi issue execution. This file only */
static int  multissue[20];
static int  issued_per_cycle = 4;
 
/* Store buffer analysis - stores are accumulated and commited when IO is
   idle. This file only */
static int  sbuf_head              = 0;
static int  sbuf_tail              = 0;
static int  sbuf_count             = 0;
static int  sbuf_buf[MAX_SBUF_LEN] = { 0 };
 
static int sbuf_prev_cycles = 0;
 
/* Variables used throughout this file to share information */
static int  breakpoint;
static int  next_delay_insn;
 
/* Forward declaration of static functions */
static void decode_execute (struct iqueue_entry *current);
 
/*---------------------------------------------------------------------------*/
/*!Get an actual value of a specific register
 
   Implementation specific. Abort if we are given a duff register. Only used
   externally to support simprintf(), which is now obsolete.
 
   @param[in] regno  The register of interest
 
   @return  The value of the register                                        */
/*---------------------------------------------------------------------------*/
uorreg_t
evalsim_reg (unsigned int  regno)
{
  if (regno < MAX_GPRS)
    {
#if RAW_RANGE_STATS
      int delta = (runtime.sim.cycles - raw_stats.reg[regno]);
 
      if ((unsigned long) delta < (unsigned long) RAW_RANGE)
        {
          raw_stats.range[delta]++;
        }
#endif /* RAW_RANGE */
 
      return cpu_state.reg[regno];
    }
  else
    {
      PRINTF ("\nABORT: read out of registers\n");
      sim_done ();
      return 0;
    }
}       /* evalsim_reg() */
 
 
/*---------------------------------------------------------------------------*/
/*!Set a specific register with value
 
   Implementation specific. Abort if we are given a duff register.
 
   @param[in] regno  The register of interest
   @param[in] value  The value to be set                                     */
/*---------------------------------------------------------------------------*/
void
setsim_reg (unsigned int  regno,
            uorreg_t      value)
{
  if (regno == 0)                /* gpr0 is always zero */
    {
      value = 0;
    }
 
  if (regno < MAX_GPRS)
    {
      cpu_state.reg[regno] = value;
    }
  else
    {
      PRINTF ("\nABORT: write out of registers\n");
      sim_done ();
    }
 
#if RAW_RANGE_STATS
  raw_stats.reg[regno] = runtime.sim.cycles;
#endif /* RAW_RANGE */
 
}       /* setsim_reg() */
 
 
/*---------------------------------------------------------------------------*/
/*!Evaluates source operand operand
 
   Implementation specific. Declared global, although this is only actually
   required for DYNAMIC_EXECUTION,
 
   @param[in] insn  The instruction
   @param[in] opd   The operand
 
   @return  The value of the source operand                                  */
/*---------------------------------------------------------------------------*/
uorreg_t
eval_operand_val (uint32_t               insn,
                  struct insn_op_struct *opd)
{
  unsigned long  operand = 0;
  unsigned long  sbit;
  unsigned int   nbits = 0;
 
  while (1)
    {
      operand |=
        ((insn >> (opd->type & OPTYPE_SHR)) & ((1 << opd->data) - 1)) <<
        nbits;
      nbits += opd->data;
 
      if (opd->type & OPTYPE_OP)
        {
          break;
        }
 
      opd++;
    }
 
  if (opd->type & OPTYPE_SIG)
    {
      sbit = (opd->type & OPTYPE_SBIT) >> OPTYPE_SBIT_SHR;
 
      if (operand & (1 << sbit))
        {
          operand |= ~REG_C (0) << sbit;
        }
    }
 
  return operand;
 
}       /* eval_operand_val() */
 
 
/*---------------------------------------------------------------------------*/
/*!Does source operand depend on computation of dest operand?
 
      Cycle t                 Cycle t+1
  dst: irrelevant         src: immediate                  always 0
  dst: reg1 direct        src: reg2 direct                0 if reg1 != reg2
  dst: reg1 disp          src: reg2 direct                always 0
  dst: reg1 direct        src: reg2 disp                  0 if reg1 != reg2
  dst: reg1 disp          src: reg2 disp                  always 1 (store must
                                                          finish before load)
  dst: flag               src: flag                       always 1
 
  @param[in] prev  Previous instruction
  @param[in] next  Next instruction
 
  @return  Non-zero if yes.                                                  */
/*---------------------------------------------------------------------------*/
static int
check_depend (struct iqueue_entry *prev,
              struct iqueue_entry *next)
{
  /* Find destination type. */
  unsigned long          type = 0;
  int                    prev_dis;
  int                    next_dis;
  orreg_t                prev_reg_val = 0;
  struct insn_op_struct *opd;
 
  if (or1ksim_or32_opcodes[prev->insn_index].flags & OR32_W_FLAG
      && or1ksim_or32_opcodes[next->insn_index].flags & OR32_R_FLAG)
    {
      return  1;
    }
 
  opd      = or1ksim_op_start[prev->insn_index];
  prev_dis = 0;
 
  while (1)
    {
      if (opd->type & OPTYPE_DIS)
        {
          prev_dis = 1;
        }
 
      if (opd->type & OPTYPE_DST)
        {
          type = opd->type;
 
          if (prev_dis)
            {
              type |= OPTYPE_DIS;
            }
 
          /* Destination is always a register */
          prev_reg_val = eval_operand_val (prev->insn, opd);
          break;
        }
 
      if (opd->type & OPTYPE_LAST)
        {
          return 0;              /* Doesn't have a destination operand */
        }
 
      if (opd->type & OPTYPE_OP)
        {
          prev_dis = 0;
        }
 
      opd++;
    }
 
  /* We search all source operands - if we find confict => return 1 */
  opd      = or1ksim_op_start[next->insn_index];
  next_dis = 0;
 
  while (1)
    {
      if (opd->type & OPTYPE_DIS)
        {
          next_dis = 1;
        }
 
      /* This instruction sequence also depends on order of execution:
           l.lw r1, k(r1)
           l.sw k(r1), r4
         Here r1 is a destination in l.sw */
 
      /* FIXME: This situation is not handeld here when r1 == r2:
           l.sw k(r1), r4
           l.lw r3, k(r2) */
      if (!(opd->type & OPTYPE_DST) || (next_dis && (opd->type & OPTYPE_DST)))
        {
          if (opd->type & OPTYPE_REG)
            {
              if (eval_operand_val (next->insn, opd) == prev_reg_val)
                {
                  return 1;
                }
            }
        }
 
      if (opd->type & OPTYPE_LAST)
        {
          break;
        }
 
      opd++;
    }
 
  return  0;
 
}       /* check_depend() */
 
 
/*---------------------------------------------------------------------------*/
/*!Should instruction NOT be executed?
 
   Modified by CZ 26/05/01 for new mode execution.
 
   @return  Nonzero if instruction should NOT be executed                    */
/*---------------------------------------------------------------------------*/
static int
fetch ()
{
  static int break_just_hit = 0;
 
  if (NULL != breakpoints)
    {
      /* MM: Check for breakpoint.  This has to be done in fetch cycle,
         because of peripheria.
         MM1709: if we cannot access the memory entry, we could not set the
         breakpoint earlier, so just check the breakpoint list.  */
      if (has_breakpoint (peek_into_itlb (cpu_state.pc)) && !break_just_hit)
        {
          break_just_hit = 1;
          return 1;             /* Breakpoint set. */
        }
      break_just_hit = 0;
    }
 
  breakpoint                 = 0;
  cpu_state.iqueue.insn_addr = cpu_state.pc;
  cpu_state.iqueue.insn      = eval_insn (cpu_state.pc, &breakpoint);
 
  /* Fetch instruction. */
  if (!except_pending)
    {
      runtime.cpu.instructions++;
    }
 
  /* update_pc will be called after execution */
  return 0;
 
}       /* fetch() */
 
 
/*---------------------------------------------------------------------------*/
/*!This code actually updates the PC value                                   */
/*---------------------------------------------------------------------------*/
static void
update_pc ()
{
  cpu_state.delay_insn    = next_delay_insn;
  cpu_state.sprs[SPR_PPC] = cpu_state.pc;       /* Store value for later */
  cpu_state.pc            = pcnext;
  pcnext                  = cpu_state.delay_insn ? cpu_state.pc_delay :
                                                   pcnext + 4;
}       /* update_pc() */
 
 
/*---------------------------------------------------------------------------*/
/*!Perform analysis of the instruction being executed
 
   This could be static for SIMPLE_EXECUTION, but made global for general use.
 
   @param[in] current  The instruction being executed                        */
/*---------------------------------------------------------------------------*/
void
analysis (struct iqueue_entry *current)
{
  if (config.cpu.dependstats)
    {
      /* Dynamic, dependency stats. */
      adddstats (cpu_state.icomplet.insn_index, current->insn_index, 1,
                 check_depend (&cpu_state.icomplet, current));
 
      /* Dynamic, functional units stats. */
      addfstats (or1ksim_or32_opcodes[cpu_state.icomplet.insn_index].func_unit,
                 or1ksim_or32_opcodes[current->insn_index].func_unit, 1,
                 check_depend (&cpu_state.icomplet, current));
 
      /* Dynamic, single stats. */
      addsstats (current->insn_index, 1);
    }
 
  if (config.cpu.superscalar)
    {
      if ((or1ksim_or32_opcodes[current->insn_index].func_unit == it_branch) ||
          (or1ksim_or32_opcodes[current->insn_index].func_unit == it_jump))
        runtime.sim.storecycles += 0;
 
      if (or1ksim_or32_opcodes[current->insn_index].func_unit == it_store)
        runtime.sim.storecycles += 1;
 
      if (or1ksim_or32_opcodes[current->insn_index].func_unit == it_load)
        runtime.sim.loadcycles += 1;
 
      /* Pseudo multiple issue benchmark */
      if ((multissue[or1ksim_or32_opcodes[current->insn_index].func_unit] < 1) ||
          (check_depend (&cpu_state.icomplet, current))
          || (issued_per_cycle < 1))
        {
          int i;
          for (i = 0; i < 20; i++)
            multissue[i] = 2;
          issued_per_cycle = 2;
          runtime.cpu.supercycles++;
          if (check_depend (&cpu_state.icomplet, current))
            runtime.cpu.hazardwait++;
          multissue[it_unknown] = 2;
          multissue[it_shift] = 2;
          multissue[it_compare] = 1;
          multissue[it_branch] = 1;
          multissue[it_jump] = 1;
          multissue[it_extend] = 2;
          multissue[it_nop] = 2;
          multissue[it_move] = 2;
          multissue[it_movimm] = 2;
          multissue[it_arith] = 2;
          multissue[it_store] = 2;
          multissue[it_load] = 2;
        }
      multissue[or1ksim_or32_opcodes[current->insn_index].func_unit]--;
      issued_per_cycle--;
    }
 
  if (config.cpu.dependstats)
    /* Instruction waits in completition buffer until retired. */
    memcpy (&cpu_state.icomplet, current, sizeof (struct iqueue_entry));
 
  if (config.sim.history)
    {
      /* History of execution */
      hist_exec_tail = hist_exec_tail->next;
      hist_exec_tail->addr = cpu_state.icomplet.insn_addr;
    }
 
  if (config.sim.exe_log)
    dump_exe_log ();
 
  if (config.sim.exe_bin_insn_log)
    dump_exe_bin_insn_log (current);
 
}       /* analysis() */
 
 
/*---------------------------------------------------------------------------*/
/*!Store buffer analysis for store instructions
 
   Stores are accumulated and commited when IO is idle
 
   @param[in] cyc  Number of cycles being analysed                           */
/*---------------------------------------------------------------------------*/
static void
sbuf_store (int cyc)
{
  int delta = runtime.sim.cycles - sbuf_prev_cycles;
 
  sbuf_total_cyc   += cyc;
  sbuf_prev_cycles  = runtime.sim.cycles;
 
  /* Take stores from buffer, that occured meanwhile */
  while (sbuf_count && delta >= sbuf_buf[sbuf_tail])
    {
      delta     -= sbuf_buf[sbuf_tail];
      sbuf_tail  = (sbuf_tail + 1) % MAX_SBUF_LEN;
      sbuf_count--;
    }
 
  if (sbuf_count)
    {
      sbuf_buf[sbuf_tail] -= delta;
    }
 
  /* Store buffer is full, take one out */
  if (sbuf_count >= config.cpu.sbuf_len)
    {
      sbuf_wait_cyc          += sbuf_buf[sbuf_tail];
      runtime.sim.mem_cycles += sbuf_buf[sbuf_tail];
      sbuf_prev_cycles       += sbuf_buf[sbuf_tail];
      sbuf_tail               = (sbuf_tail + 1) % MAX_SBUF_LEN;
      sbuf_count--;
    }
 
  /* Put newest store in the buffer */
  sbuf_buf[sbuf_head] = cyc;
  sbuf_head           = (sbuf_head + 1) % MAX_SBUF_LEN;
  sbuf_count++;
 
}       /* sbuf_store() */
 
 
/*---------------------------------------------------------------------------*/
/*!Store buffer analysis for load instructions
 
   Previous stores should commit, before any load                            */
/*---------------------------------------------------------------------------*/
static void
sbuf_load ()
{
  int delta = runtime.sim.cycles - sbuf_prev_cycles;
  sbuf_prev_cycles = runtime.sim.cycles;
 
  /* Take stores from buffer, that occured meanwhile */
  while (sbuf_count && delta >= sbuf_buf[sbuf_tail])
    {
      delta     -= sbuf_buf[sbuf_tail];
      sbuf_tail  = (sbuf_tail + 1) % MAX_SBUF_LEN;
      sbuf_count--;
    }
 
  if (sbuf_count)
    {
      sbuf_buf[sbuf_tail] -= delta;
    }
 
  /* Wait for all stores to complete */
  while (sbuf_count > 0)
    {
      sbuf_wait_cyc          += sbuf_buf[sbuf_tail];
      runtime.sim.mem_cycles += sbuf_buf[sbuf_tail];
      sbuf_prev_cycles       += sbuf_buf[sbuf_tail];
      sbuf_tail               = (sbuf_tail + 1) % MAX_SBUF_LEN;
      sbuf_count--;
    }
}       /* sbuf_load() */
 
/*---------------------------------------------------------------------------*/
/*!Outputs dissasembled instruction                                          */
/*---------------------------------------------------------------------------*/
void
dump_exe_log ()
{
  oraddr_t      insn_addr = cpu_state.iqueue.insn_addr;
  unsigned int  i;
  unsigned int  j;
  uorreg_t      operand;
 
  if (insn_addr == 0xffffffff)
    {
      return;
    }
 
  if ((config.sim.exe_log_start <= runtime.cpu.instructions) &&
      ((config.sim.exe_log_end <= 0) ||
       (runtime.cpu.instructions <= config.sim.exe_log_end)))
    {
      struct label_entry *entry;
 
      if (config.sim.exe_log_marker &&
          !(runtime.cpu.instructions % config.sim.exe_log_marker))
        {
          fprintf (runtime.sim.fexe_log,
                   "--------------------- %8lli instruction "
                   "---------------------\n",
                   runtime.cpu.instructions);
        }
 
      switch (config.sim.exe_log_type)
        {
        case EXE_LOG_HARDWARE:
          fprintf (runtime.sim.fexe_log,
                   "\nEXECUTED(%11llu): %" PRIxADDR ":  ",
                   runtime.cpu.instructions, insn_addr);
          fprintf (runtime.sim.fexe_log, "%.2x%.2x",
                   eval_direct8 (insn_addr, 0, 0),
                   eval_direct8 (insn_addr + 1, 0, 0));
          fprintf (runtime.sim.fexe_log, "%.2x%.2x",
                   eval_direct8 (insn_addr + 2, 0, 0),
                   eval_direct8 (insn_addr + 3, 0, 0));
 
          for (i = 0; i < MAX_GPRS; i++)
            {
              if (i % 4 == 0)
                {
                  fprintf (runtime.sim.fexe_log, "\n");
                }
 
              fprintf (runtime.sim.fexe_log, "GPR%2u: %" PRIxREG "  ", i,
                       cpu_state.reg[i]);
            }
 
          fprintf (runtime.sim.fexe_log, "\n");
          fprintf (runtime.sim.fexe_log, "SR   : %.8" PRIx32 "  ",
                   cpu_state.sprs[SPR_SR]);
          fprintf (runtime.sim.fexe_log, "EPCR0: %" PRIxADDR "  ",
                   cpu_state.sprs[SPR_EPCR_BASE]);
          fprintf (runtime.sim.fexe_log, "EEAR0: %" PRIxADDR "  ",
                   cpu_state.sprs[SPR_EEAR_BASE]);
          fprintf (runtime.sim.fexe_log, "ESR0 : %.8" PRIx32 "\n",
                   cpu_state.sprs[SPR_ESR_BASE]);
          break;
 
        case EXE_LOG_SIMPLE:
        case EXE_LOG_SOFTWARE:
          or1ksim_disassemble_index (cpu_state.iqueue.insn,
                             cpu_state.iqueue.insn_index);
 
          entry = get_label (insn_addr);
          if (entry)
            {
              fprintf (runtime.sim.fexe_log, "%s:\n", entry->name);
            }
 
          if (config.sim.exe_log_type == EXE_LOG_SOFTWARE)
            {
              struct insn_op_struct *opd =
                or1ksim_op_start[cpu_state.iqueue.insn_index];
 
              j = 0;
              while (1)
                {
                  operand = eval_operand_val (cpu_state.iqueue.insn, opd);
                  while (!(opd->type & OPTYPE_OP))
                    {
                      opd++;
                    }
                  if (opd->type & OPTYPE_DIS)
                    {
                      fprintf (runtime.sim.fexe_log,
                               "EA =%" PRIxADDR " PA =%" PRIxADDR " ",
                               cpu_state.insn_ea,
                               peek_into_dtlb (cpu_state.insn_ea, 0, 0));
                      opd++;    /* Skip of register operand */
                      j++;
                    }
                  else if ((opd->type & OPTYPE_REG) && operand)
                    {
                      fprintf (runtime.sim.fexe_log, "r%-2i=%" PRIxREG " ",
                               (int) operand, evalsim_reg (operand));
                    }
                  else
                    {
                      fprintf (runtime.sim.fexe_log, "             ");
                    }
                  j++;
                  if (opd->type & OPTYPE_LAST)
                    {
                      break;
                    }
                  opd++;
                }
              if (or1ksim_or32_opcodes[cpu_state.iqueue.insn_index].flags & OR32_R_FLAG)
                {
                  fprintf (runtime.sim.fexe_log, "SR =%" PRIxREG " ",
                           cpu_state.sprs[SPR_SR]);
                  j++;
                }
              while (j < 3)
                {
                  fprintf (runtime.sim.fexe_log, "             ");
                  j++;
                }
            }
          fprintf (runtime.sim.fexe_log, "%" PRIxADDR " ", insn_addr);
          fprintf (runtime.sim.fexe_log, "%s\n", or1ksim_disassembled);
        }
    }
}       /* dump_exe_log() */
 
 
 
/*---------------------------------------------------------------------------*/
/*!Outputs binary copy of instruction to a file                              */
/*---------------------------------------------------------------------------*/
void
dump_exe_bin_insn_log (struct iqueue_entry *current)
{
  // Do endian swap before spitting out (will be kept in LE on a LE machine)
  // but more useful to see it in big endian format.
  // Should probably host htonl().
  uint32_t insn = (((current->insn & 0xff)<<24) |
                   ((current->insn & 0xff00)<<8) |
                   ((current->insn & 0xff0000)>>8) |
                   ((current->insn & 0xff000000)>>24));
 
  //for(i=0;i<4;i++) tmp_insn[i] = eval_direct8 (insn_addr+i, 0, 0);
 
  // Dump it into binary log file
  fwrite((void*)&insn, 4, 1, runtime.sim.fexe_bin_insn_log);
 
 
}       /* dump_exe_bin_insn_log() */
 
 
/*---------------------------------------------------------------------------*/
/*!Dump registers
 
   Supports the CLI 'r' and 't' commands                                     */
/*---------------------------------------------------------------------------*/
void
dumpreg ()
{
  int       i;
  oraddr_t  physical_pc;
 
  if ((physical_pc = peek_into_itlb (cpu_state.iqueue.insn_addr)))
    {
      disassemble_memory (physical_pc, physical_pc + 4, 0);
    }
  else
    {
      PRINTF ("INTERNAL SIMULATOR ERROR:\n");
      PRINTF ("no translation for currently executed instruction\n");
    }
 
  // generate_time_pretty (temp, runtime.sim.cycles * config.sim.clkcycle_ps);
  PRINTF (" (executed) [cycle %lld, #%lld]\n", runtime.sim.cycles,
          runtime.cpu.instructions);
  if (config.cpu.superscalar)
    {
      PRINTF ("Superscalar CYCLES: %u", runtime.cpu.supercycles);
    }
  if (config.cpu.hazards)
    {
      PRINTF ("  HAZARDWAIT: %u\n", runtime.cpu.hazardwait);
    }
  else if (config.cpu.superscalar)
    {
      PRINTF ("\n");
    }
 
  if ((physical_pc = peek_into_itlb (cpu_state.pc)))
    {
      disassemble_memory (physical_pc, physical_pc + 4, 0);
    }
  else
    {
      PRINTF ("%" PRIxADDR ": : xxxxxxxx  ITLB miss follows", cpu_state.pc);
    }
 
  PRINTF (" (next insn) %s", (cpu_state.delay_insn ? "(delay insn)" : ""));
 
  for (i = 0; i < MAX_GPRS; i++)
    {
      if (i % 4 == 0)
        {
          PRINTF ("\n");
        }
 
      PRINTF ("GPR%.2u: %" PRIxREG "  ", i, evalsim_reg (i));
    }
 
  PRINTF ("flag: %u\n", cpu_state.sprs[SPR_SR] & SPR_SR_F ? 1 : 0);
 
}       /* dumpreg() */
 
 
/*---------------------------------------------------------------------------*/
/*!Trace an instruction
 
   Supports GDB tracing                                                      */
/*---------------------------------------------------------------------------*/
void
trace_instr ()
{
  oraddr_t  physical_pc;
 
  if ((physical_pc = peek_into_itlb (cpu_state.iqueue.insn_addr)))
    {
      disassemble_instr (physical_pc, cpu_state.iqueue.insn_addr,
                         cpu_state.iqueue.insn);
    }
  else
    {
      PRINTF ("Instruction address translation failed: no trace available\n");
    }
}       /* trace_instr () */
 
 
/*---------------------------------------------------------------------------*/
/*!Wrapper around real decode_execute function
 
   Some statistics here only
 
   @param[in] current  Instruction being executed                            */
/*---------------------------------------------------------------------------*/
static void
decode_execute_wrapper (struct iqueue_entry *current)
{
  breakpoint = 0;
 
#ifndef HAVE_EXECUTION
#error HAVE_EXECUTION has to be defined in order to execute programs.
#endif
 
  decode_execute (current);
 
  if (breakpoint)
    {
      except_handle (EXCEPT_TRAP, cpu_state.sprs[SPR_EEAR_BASE]);
    }
}       /* decode_execute_wrapper() */
 
/*---------------------------------------------------------------------------*/
/*!Reset the CPU                                                             */
/*---------------------------------------------------------------------------*/
void
cpu_reset ()
{
  int               i;
  struct hist_exec *hist_exec_head = NULL;
  struct hist_exec *hist_exec_new;
 
  runtime.sim.cycles       = 0;
  runtime.sim.loadcycles   = 0;
  runtime.sim.storecycles  = 0;
  runtime.cpu.instructions = 0;
  runtime.cpu.supercycles  = 0;
  runtime.cpu.hazardwait   = 0;
 
  for (i = 0; i < MAX_GPRS; i++)
    {
      setsim_reg (i, 0);
    }
 
  memset (&cpu_state.iqueue,   0, sizeof (cpu_state.iqueue));
  memset (&cpu_state.icomplet, 0, sizeof (cpu_state.icomplet));
 
  sbuf_head        = 0;
  sbuf_tail        = 0;
  sbuf_count       = 0;
  sbuf_prev_cycles = 0;
 
  /* Initialise execution history circular buffer */
  for (i = 0; i < HISTEXEC_LEN; i++)
    {
      hist_exec_new = malloc (sizeof (struct hist_exec));
 
      if (!hist_exec_new)
        {
          fprintf (stderr, "Out-of-memory\n");
          exit (1);
        }
 
      if (!hist_exec_head)
        {
          hist_exec_head = hist_exec_new;
        }
      else
        {
          hist_exec_tail->next = hist_exec_new;
        }
 
      hist_exec_new->prev = hist_exec_tail;
      hist_exec_tail = hist_exec_new;
    }
 
  /* Make hist_exec_tail->next point to hist_exec_head */
  hist_exec_tail->next = hist_exec_head;
  hist_exec_head->prev = hist_exec_tail;
 
  /* MM1409: All progs should start at reset vector entry! This sorted out by
     setting the cpu_state.pc field below. Not clear this is very good code! */
 
  /* Patches suggested by Shinji Wakatsuki, so that the vector address takes
     notice of the Exception Prefix High bit of the Supervision register */
  pcnext = (cpu_state.sprs[SPR_SR] & SPR_SR_EPH ? 0xf0000000 : 0x00000000);
 
  if (config.sim.verbose)
    {
      PRINTF ("Starting at 0x%" PRIxADDR "\n", pcnext);
    }
 
  cpu_state.pc  = pcnext;
  pcnext       += 4;
 
  /* MM1409: All programs should set their stack pointer!  */
  except_handle (EXCEPT_RESET, 0);
  update_pc ();
 
  except_pending = 0;
  cpu_state.pc   = cpu_state.sprs[SPR_SR] & SPR_SR_EPH ?
    0xf0000000 + EXCEPT_RESET : EXCEPT_RESET;
 
}       /* cpu_reset() */
 
 
/*---------------------------------------------------------------------------*/
/*!Simulates one CPU clock cycle
 
  @return  non-zero if a breakpoint is hit, zero otherwise.                  */
/*---------------------------------------------------------------------------*/
int
cpu_clock ()
{
  except_pending  = 0;
  next_delay_insn = 0;
 
  if (fetch ())
    {
      PRINTF ("Breakpoint hit.\n");
      return  1;
    }
 
  if (except_pending)
    {
      update_pc ();
      except_pending = 0;
      return  0;
    }
 
  if (breakpoint)
    {
      except_handle (EXCEPT_TRAP, cpu_state.sprs[SPR_EEAR_BASE]);
      update_pc ();
      except_pending = 0;
      return  0;
    }
 
  decode_execute_wrapper (&cpu_state.iqueue);
  update_pc ();
  return  0;
 
}       /* cpu_clock() */
 
 
/*---------------------------------------------------------------------------*/
/*!If decoding cannot be found, call this function                           */
/*---------------------------------------------------------------------------*/
#if SIMPLE_EXECUTION
void
l_invalid (struct iqueue_entry *current)
{
#else
void
l_invalid ()
{
#endif
  except_handle (EXCEPT_ILLEGAL, cpu_state.iqueue.insn_addr);
 
}       /* l_invalid() */
 
 
/*---------------------------------------------------------------------------*/
/*!The main execution loop                                                   */
/*---------------------------------------------------------------------------*/
void
exec_main ()
{
  long long time_start;
 
  while (1)
    {
      time_start = runtime.sim.cycles;
      if (config.debug.enabled)
        {
          while (runtime.cpu.stalled)
            {
              if (config.debug.rsp_enabled)
                {
                  handle_rsp ();
                }
              else
                {
                  fprintf (stderr, "ERROR: CPU stalled and GDB connection not "
                           "enabled: Invoking CLI and terminating.\n");
                  /* Dump the user into interactive mode.  From there he or
                     she can decide what to do. */
                  handle_sim_command ();
                  sim_done ();
                }
              if (runtime.sim.iprompt)
                handle_sim_command ();
            }
        }
 
      /* Each cycle has counter of mem_cycles; this value is joined with cycles
         at the end of the cycle; no sim originated memory accesses should be
         performed inbetween. */
      runtime.sim.mem_cycles = 0;
 
      if (!config.pm.enabled ||
          !(config.pm.enabled &
            (cpu_state.sprs[SPR_PMR] & (SPR_PMR_DME | SPR_PMR_SME))))
        {
          if (cpu_clock ())
            {
              /* A breakpoint has been hit, drop to interactive mode */
              handle_sim_command ();
            }
        }
 
      /* If we are tracing, dump after each instruction. */
      if (!runtime.sim.hush)
        {
          trace_instr ();
        }
 
      if (config.vapi.enabled && runtime.vapi.enabled)
        {
          vapi_check ();
        }
 
      if (config.debug.enabled)
        {
          if (cpu_state.sprs[SPR_DMR1] & SPR_DMR1_ST)
            {
              set_stall_state (1);
 
              if (config.debug.rsp_enabled)
                {
                  rsp_exception (EXCEPT_TRAP);
                }
            }
        }
 
      runtime.sim.cycles        += runtime.sim.mem_cycles;
      scheduler.job_queue->time -= runtime.sim.cycles - time_start;
 
      if (scheduler.job_queue->time <= 0)
        {
          do_scheduler ();
        }
    }
}       /* exec_main() */
 
/*---------------------------------------------------------------------------*/
/*!Update the rounding mode variable the softfloat library reads             */
/*---------------------------------------------------------------------------*/
static void
float_set_rm ()
{
  //
  // float_rounding_mode is used by the softfloat library, it is declared in
  // "softfloat.h"
  //
  switch(cpu_state.sprs[SPR_FPCSR] & SPR_FPCSR_RM)
    {
    case FPCSR_RM_RN:
      //printf("or1ksim <%s>: rounding mode RN\n",__FUNCTION__);
      float_rounding_mode = float_round_nearest_even;
      break;
    case FPCSR_RM_RZ:
      //printf("or1ksim <%s>: rounding mode RZ\n",__FUNCTION__);
      float_rounding_mode = float_round_to_zero;
      break;
    case FPCSR_RM_RIP:
      //printf("or1ksim <%s>: rounding mode R+\n",__FUNCTION__);
      float_rounding_mode = float_round_up;
      break;
    case FPCSR_RM_RIN:
      //printf("or1ksim <%s>: rounding mode R-\n",__FUNCTION__);
      float_rounding_mode = float_round_down;
      break;
    }
}
 
/*---------------------------------------------------------------------------*/
/*!Update the OR1K's FPCSR after each floating point instruction             */
/*---------------------------------------------------------------------------*/
static void
float_set_flags ()
{
  // Get the flags from softfloat's variable and set the OR1K's FPCR values
  // First clear all flags in OR1K FPCSR
  cpu_state.sprs[SPR_FPCSR] &= ~SPR_FPCSR_ALLF;
 
  if (float_exception_flags & float_flag_invalid)
    cpu_state.sprs[SPR_FPCSR] |= SPR_FPCSR_IVF;
  if (float_exception_flags & float_flag_divbyzero)
    cpu_state.sprs[SPR_FPCSR] |= SPR_FPCSR_DZF;
  if (float_exception_flags & float_flag_overflow)
    cpu_state.sprs[SPR_FPCSR] |= SPR_FPCSR_OVF;
  if (float_exception_flags & float_flag_underflow)
    cpu_state.sprs[SPR_FPCSR] |= SPR_FPCSR_UNF;
  if (float_exception_flags & float_flag_inexact)
    cpu_state.sprs[SPR_FPCSR] |= SPR_FPCSR_IXF;
  /*
  printf("or1ksim: post-fp-op flags from softfloat: %x%x%x%x%x\n",
         !!(float_exception_flags & float_flag_invalid),
         !!(float_exception_flags & float_flag_divbyzero),
         !!(float_exception_flags & float_flag_overflow),
         !!(float_exception_flags & float_flag_underflow),
         !!(float_exception_flags & float_flag_inexact));
  */
  // TODO: Call FP exception is FPEE set and any of the flags were set
  /*
     if ((cpu_state.sprs[SPR_FPCSR] & SPR_FPCSR_FPEE) &
     (|(cpu_state.sprs[SPR_FPCSR] & SPR_FPCSR_ALLF)))
     except_handle (EXCEPT_FPE, cpu_state.iqueue.insn_addr);
  */
  // Now clear softfloat's flags:
  float_exception_flags = 0;
 
}
 
#if COMPLEX_EXECUTION
 
/* Include generated/built in decode_execute function */
#include "execgen.c"
 
#elif SIMPLE_EXECUTION
 
 
/*---------------------------------------------------------------------------*/
/*!Evaluates source operand
 
   Implementation specific.
 
   @param[in] op_no       The operand
   @param[in] insn_index  Address of the instruction
   @param[in] insn        The instruction
 
   @return  The value of the operand                                         */
/*---------------------------------------------------------------------------*/
static uorreg_t
eval_operand (int            op_no,
              unsigned long  insn_index,
              uint32_t       insn)
{
  struct insn_op_struct *opd = or1ksim_op_start[insn_index];
  uorreg_t               ret;
 
  while (op_no)
    {
      if (opd->type & OPTYPE_LAST)
        {
          fprintf (stderr,
                   "Instruction requested more operands than it has\n");
          exit (1);
        }
 
      if ((opd->type & OPTYPE_OP) && !(opd->type & OPTYPE_DIS))
        {
          op_no--;
        }
 
      opd++;
    }
 
  if (opd->type & OPTYPE_DIS)
    {
      ret = eval_operand_val (insn, opd);
 
      while (!(opd->type & OPTYPE_OP))
        {
          opd++;
        }
 
      opd++;
      ret               += evalsim_reg (eval_operand_val (insn, opd));
      cpu_state.insn_ea  = ret;
 
      return  ret;
    }
 
  if (opd->type & OPTYPE_REG)
    {
      return  evalsim_reg (eval_operand_val (insn, opd));
    }
 
  return  eval_operand_val (insn, opd);
 
}       /* eval_operand() */
 
 
/*---------------------------------------------------------------------------*/
/*!Set destination operand (register direct) with value.
 
   Implementation specific.
 
   @param[in] op_no       The operand
   @param[in] value       The value to set
   @param[in] insn_index  Address of the instruction
   @param[in] insn        The instruction                                    */
/*---------------------------------------------------------------------------*/
static void
set_operand (int            op_no,
             orreg_t        value,
             unsigned long  insn_index,
             uint32_t       insn)
{
  struct insn_op_struct *opd = or1ksim_op_start[insn_index];
 
  while (op_no)
    {
      if (opd->type & OPTYPE_LAST)
        {
          fprintf (stderr,
                   "Instruction requested more operands than it has\n");
          exit (1);
        }
 
      if ((opd->type & OPTYPE_OP) && !(opd->type & OPTYPE_DIS))
        {
          op_no--;
        }
 
      opd++;
    }
 
  if (!(opd->type & OPTYPE_REG))
    {
      fprintf (stderr, "Trying to set a non-register operand\n");
      exit (1);
    }
 
  setsim_reg (eval_operand_val (insn, opd), value);
 
}       /* set_operand() */
 
 
/*---------------------------------------------------------------------------*/
/*!Simple and rather slow decoding function
 
   Based on built automata.
 
   @param[in] current  The current instruction to execute                    */
/*---------------------------------------------------------------------------*/
static void
decode_execute (struct iqueue_entry *current)
{
  int insn_index;
 
  current->insn_index = insn_index = or1ksim_insn_decode (current->insn);
 
  if (insn_index < 0)
    {
      l_invalid (current);
    }
  else
    {
      or1ksim_or32_opcodes[insn_index].exec (current);
    }
 
  if (do_stats)
    analysis (&cpu_state.iqueue);
}
 
#include "insnset.c"
 
#else
# error "Must define SIMPLE_EXECUTION, COMPLEX_EXECUTION"
#endif
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[/] [openrisc/] [trunk/] [or1ksim/] [cpu/] [or32/] [execute.c] - Blame information for rev 671

Line No.	Rev	Author	Line
1	19	jeremybenn	`/* execute.c -- OR1K architecture dependent simulation`
2
3			`Copyright (C) 1999 Damjan Lampret, lampret@opencores.org`
4			Copyright (C) 2005 Gy�rgy `nog' Jeney, nog@sdf.lonestar.org
5			`Copyright (C) 2008 Embecosm Limited`
6	233	julius	`Copyright (C) 2010 ORSoC AB`
7	19	jeremybenn
8			`Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>`
9	233	julius	`Contributor Julius Baxter <julius.baxter@orsoc.se>`
10	19	jeremybenn
11			`This file is part of OpenRISC 1000 Architectural Simulator.`
12
13			`This program is free software; you can redistribute it and/or modify it`
14			`under the terms of the GNU General Public License as published by the Free`
15			`Software Foundation; either version 3 of the License, or (at your option)`
16			`any later version.`
17
18			`This program is distributed in the hope that it will be useful, but WITHOUT`
19			`ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or`
20			`FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for`
21			`more details.`
22
23			`You should have received a copy of the GNU General Public License along`
24			`with this program. If not, see <http://www.gnu.org/licenses/>. */`
25
26			`/* This program is commented throughout in a fashion suitable for processing`
27			`with Doxygen. */`
28
29
30			`/* Most of the OR1K simulation is done in here.`
31
32			`When SIMPLE_EXECUTION is defined below a file insnset.c is included!`
33			`*/`
34
35			`/* Autoconf and/or portability configuration */`
36			`#include "config.h"`
37			`#include "port.h"`
38
39			`/* System includes */`
40			`#include <stdlib.h>`